Index: Makefile
==================================================================
--- Makefile
+++ Makefile
@@ -1,9 +1,9 @@
 CPPFLAGS := -I. -DUSE_TCL_STUBS=1 -DXVFS_MODE_FLEXIBLE
 CFLAGS   := -fPIC -g3 -ggdb3 -Wall
 LDFLAGS  :=
-LIBS     := -ltclstub8.6 -ldl
+LIBS     := -ltclstub8.6
 
 all: example.so
 
 example.c: $(shell find example -type f) $(shell find lib -type f) xvfs.c.rvt xvfs-create Makefile
 	./xvfs-create --directory example --name example > example.c.new

Index: xvfs-core.c
==================================================================
--- xvfs-core.c
+++ xvfs-core.c
@@ -183,24 +183,56 @@
 	}
 	
 	return(TCL_OK);
 }
 #endif
+
+#if defined(XVFS_MODE_FLEXIBLE) || defined(XVFS_MODE_SERVER)
+struct xvfs_tclfs_server_info {
+	char magic[XVFS_PROTOCOL_SERVER_MAGIC_LEN];
+	int (*registerProc)(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo);
+};
+#endif
 
 #if defined(XVFS_MODE_FLEXIBLE)
-#include <dlfcn.h>
 int xvfs_flexible_register(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) {
-	int (*xvfs_register)(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) = NULL;
+	ClientData fsHandlerDataRaw;
+	struct xvfs_tclfs_server_info *fsHandlerData;
+	const Tcl_Filesystem *fsHandler;
+	int (*xvfs_register)(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo);
+	Tcl_Obj *rootPathObj;
+
+	xvfs_register = &xvfs_standalone_register;
+
+	rootPathObj = Tcl_NewStringObj(XVFS_ROOT_MOUNTPOINT, -1);
+	if (!rootPathObj) {
+		return(xvfs_register(interp, fsInfo));
+	}
+
+	Tcl_IncrRefCount(rootPathObj);
+	fsHandler = Tcl_FSGetFileSystemForPath(rootPathObj);
+	Tcl_DecrRefCount(rootPathObj);
+
+	if (!fsHandler) {
+		return(xvfs_register(interp, fsInfo));
+	}
+
+	fsHandlerDataRaw = Tcl_FSData(fsHandler);
+	if (!fsHandlerDataRaw) {
+		return(xvfs_register(interp, fsInfo));
+	}
+
+	fsHandlerData = (struct xvfs_tclfs_server_info *) fsHandlerDataRaw;
 
 	/*
-	 * XXX:TODO: Find some way to use Tcl_FindSymbol() to do this
+	 * XXX:TODO: What is the chance that the handler for //xvfs:/ hold
+	 * client data smaller than XVFS_PROTOCOL_SERVER_MAGIC_LEN ?
 	 */
-	xvfs_register = dlsym(NULL, "Xvfs_Register");
-	if (!xvfs_register) {
-		xvfs_register = &xvfs_standalone_register;
+	if (memcmp(fsHandlerData->magic, XVFS_PROTOCOL_SERVER_MAGIC, sizeof(fsHandlerData->magic)) == 0) {
+		xvfs_register = fsHandlerData->registerProc;
 	}
-	
+
 	return(xvfs_register(interp, fsInfo));
 }
 #endif
 
 #if defined(XVFS_MODE_SERVER)

Index: xvfs-core.h
==================================================================
--- xvfs-core.h
+++ xvfs-core.h
@@ -2,10 +2,12 @@
 #define XVFS_CORE_H_1B4B28D60EBAA11D5FF85642FA7CA22C29E8E817 1
 
 #include <tcl.h>
 
 #define XVFS_PROTOCOL_VERSION 1
+#define XVFS_PROTOCOL_SERVER_MAGIC "\xD4\xF3\x05\x96\x25\xCF\xAF\xFE"
+#define XVFS_PROTOCOL_SERVER_MAGIC_LEN 8
 
 typedef const char **(*xvfs_proc_getChildren_t)(const char *path, Tcl_WideInt *count);
 typedef const unsigned char *(*xvfs_proc_getData_t)(const char *path, Tcl_WideInt start, Tcl_WideInt *length);
 typedef int (*xvfs_proc_getStat_t)(const char *path, Tcl_StatBuf *statBuf);